Replacing variable values with values with a space

I need to merge two data sets, but one of them has one thing labelled two ways: "Place A" and "Place_A". I want to keep it as "Place A" Because I am plotting this data later on and the _ is not a beautiful thing.

Then, I need to merge the data sets based on place, but that is not the issue here, I am trying to replace "Place_A" with "Place A" in one data set so when I merge, they are recognized as the same variable. Code: